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Twitch Chat Messages
Each Twitch channel is stored as its own dataset config, with its chat messages under data/<channel>/. Data arrives as small append-only chunk files (data/<channel>/<chunk-id>.jsonl) added on every publish cycle -- existing chunks are immutable and never re-uploaded, so cost per publish only scales with new messages, not the dataset's total size. Sharding chunks into a per-channel directory also keeps any single directory well under the Hub's 10,000-files-per-directory limit. Some channels also have a one-time legacy data/<channel>.jsonl from before this format existed.
Important row fields: raw_message, message_id, user_id, username, text, badges, emotes, tmi_sent_ts, and stream_offset_ms.
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